The rim is tapered on both sides and STATES OF does display some strike weakness, I am convinced that it is a genuine incomplete planchet error. Regarding the Blakesley Effect, it tends to be weaker on coins with a straight clip vs. a curved clip. Given two clips of equal size, a curved clip would display a stronger BE because the diameter at the clip site would be smaller than that of a straight clip(larger diameter equals more force applied to the edges during the upsetting process).
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